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How do thunderstorms form?

Thunderstorms happen when warm, moist air rises rapidly, creating tall cloud formations. Inside these clouds, ice crystals and water droplets collide, building up electrical charges. When these charges become too great, they release as lightning, which heats the air and causes the sound of thunder. The story mentions thunderstorms as part of the unsettled bank holiday weather.

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Thunderstorms and rain to hit UK this bank holiday weekend

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